216257712 has 40 divisors (see below), whose sum is σ = 609455040. Its totient is φ = 65532480.

The previous prime is 216257689. The next prime is 216257737. The reversal of 216257712 is 217752612.

216257712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204262 + ... + 205317.

It is an arithmetic number, because the mean of its divisors is an integer number (15236376).

Almost surely, 2^216257712 is an apocalyptic number.

216257712 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

216257712 is an abundant number, since it is smaller than the sum of its proper divisors (393197328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216257712 is a wasteful number, since it uses less digits than its factorization.

216257712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409601 (or 409595 counting only the distinct ones).

The product of its digits is 11760, while the sum is 33.

The square root of 216257712 is about 14705.7033833816. The cubic root of 216257712 is about 600.2385273841.

The spelling of 216257712 in words is "two hundred sixteen million, two hundred fifty-seven thousand, seven hundred twelve".